YES, it really does glow that brightly under black-light! We barely got close and this Antique ca 1918-1938 Czechoslovakian Vaseline Glass Pendant lit right up indicating a high Uranium content. This large oval Brass framed glass pendant is stunning and clearly signed Cechoslov on the reverse. The faceted glass crystal is a deep yellow, framed on the outside so the light shines through showing off the beauty of the large stone. The metal is understated but intricate with rope wrapped brass clipped into a frame around the stone. The outside frame is mostly smooth in back(no rope) and the pendant is faceted on both sides-front and back. There is a small loop at the top to attach to your favorite chain. The pendant is in excellent condition, minor wear. It looks like the table of the stone was buffed or round cut which is the 'thumbprint' type marks you see in some of the photos. These appear to be original to manufacture and are very light - this looks like a piece that could easily be buffed by a jeweler although it would not be a necessity, its a stunning Antique Glass Jewelry piece!! ... ***** Weight : 16 grams Measurements: 1.75 x 1.25 inches ***** REFERENCES UTILIZED: Gemstones of the World by Walter Schumann; Gemstone Buying Guide by Renee Newman GG; Crescent Books Color Treasury of Gems and Jewels; Collins Gemstones; Buying Jewelry by Anne Bingham

very good, see description for more detail. Signatures include Chechoslov